Warmflow Oil Boilers: Prices, Benefits and Review

Warmflow is Northern Ireland’s leading manufacturer of oil-fired boilers and has over four decades of experience in heating homes of all shapes and sizes across the UK and Ireland. The brand’s large range of oil boilers includes combi, system and regular boilers, as well as internal, external and boiler house solutions. In addition to manufacturing award-winning oil boilers, Warmflow offers a variety of other products, such as cylinders and renewables including Europe’s most efficient ground source heat pump.

Warmflow Combi Boilers Price Range – The UK and Ireland’s only AAA Rated Oil Boilers

Combi boilers from Warmflow don’t need to be installed with a cylinder or tank, making them ideal if you don’t have a lot of space at home. As they have a unique patented stainless steel heat exchanger, Warmflow combi boilers also offer you unparalleled efficiency. These boilers are the UK and Ireland’s only AAA-rated oil combi boilers and can save you up to 5 litres of fuel per week compared to alternative oil boiler brands. The Warmflow oil combi range includes indoor and outdoor boilers in a variety of outputs to suit your requirements. 

Here are the latest Warmflow oil combi boilers, which cost between £1,970 and £2,570:    

COMBI OIL BOILER SERIES	SIZES	SIZE OF HOME	PRICE
Agentis Internal Combi	15 – 33kW	Small to medium-sized homes with one bathroom.	£1,970 – £2,450
Agentis External Combi	15 – 33kW	Small to medium-sized homes with one bathroom.	£2,150 – £2,570

Warmflow System Boilers Price Range – Can Meet High Hot Water Demand

Warmflow oil system boilers come in a range of outputs from 15kW to 44kW and are suitable for homes with a high demand for hot water because they have to be installed alongside a hot water storage cylinder. Models include internal and external solutions, which means you can have a Warmflow oil system boiler installed outside if you don’t have enough room inside your home for the internal unit. There are currently just two system boilers available from Warmflow, with prices ranging from £1,370 to £2,040.

All Warmflow oil system boilers have a unique patented stainless steel heat exchanger and come in a range of outputs, including the following options:    

SYSTEM OIL BOILER SERIES	SIZES	SIZE OF HOME	PRICE
Agentis Internal System	15 – 33kW	Small, medium and large homes with multiple bathrooms.	£1,370 – £1,955
Agentis External System	15 – 33kW	Small, medium and large homes with multiple bathrooms.	£1,670 – £2,040

Warmflow Regular Boilers Price Range – Ideal for Homes with Multiple Bathrooms

Regular boilers are suited to homes where there are two or more bathrooms and where a lot of hot water is used. So, if you have a large household and you often find that two showers or baths are running at the same time, a regular boiler will handle your hot water demand. Also called heat-only or conventional boilers, regular boilers from Warmflow include models that are designed for indoor or outdoor use, giving you the choice to have your new boiler installed in a kitchen or utility room or somewhere outside. 

Internal and external Warmflow oil regular boiler options and prices are as follows:    

REGULAR OIL BOILER SERIES	SIZES	SIZE OF HOME	PRICE
Agentis Internal Heat Only	15-44kW	Medium to large homes with multiple bathrooms.	£1,170 – £1,772
Agentis External Heat Only	15-44kW	Medium to large homes with multiple bathrooms.	£1,430 -£2,100
Agentis Internal Pumped Regular	15-44kW	Medium to large homes with multiple bathrooms.	£1,310 – £1,925
Agentis External Pumped Regular	15-44kW	Medium to large homes with multiple bathrooms.	£1,540 – £2,360

Warmflow Boiler House Boilers Price Range – Suitable for Garage and Boiler House Applications

Warmflow has manufactured an oil-fired boiler house model which is specifically designed to be installed in a garage or a boiler house. It is, however, suitable for indoor installation as well. The boiler house boiler has a blue casing and uses the same unique patented stainless steel heat exchanger found in other Warmflow models. This boiler also has the latest Riello low NOx burner technology to ensure the unit stays quiet in operation.

The boiler house model from Warmflow comes in the following output options:    

BOILER HOUSE BOILER SERIES	SIZES	SIZE OF HOME	PRICE
Agentis Boiler House Oil Boiler	15-33kW	Medium to large homes with multiple bathrooms.	£1,020 – £1,230

Why Choose Warmflow?

Warmflow oil boilers are award-winning products that are made in a state of the art facility in Northern Ireland. The brand manufacturers a good range of heating systems that are easy to install and offer value for money, as well as excellent fuel efficiency. When you choose a Warmflow boiler for your home, you can rest assured that it has been made using only the highest quality materials and parts to deliver high efficiency levels and cost savings.

Award-Winning Oil Boilers

By being super-efficient and easy to install, it’s no wonder that Warmflow has won awards for its oil-fired boiler range. Not only that, but the brand has manufactured the only AAA-rated combi boilers in the UK and Ireland, which means its combi boilers are the most efficient oil units your money can buy. This, of course, means that you should notice a drop in your fuel bills when you get a Warmflow boiler installed.

High Quality Components

A boiler is only as good as its technology and components, which is why Warmflow only uses what it deems to be the very best. For example, Warmflow boilers use the latest Riello low NOx burner technology to exceed the legislative requirements. What’s more, Warmflow uses a unique patented stainless steel heat exchanger to optimise efficiencies and provide consistent levels of heat while ensuring emissions and energy bills stay low.

Which? Score

The overall Which? brand score for Warmflow boilers is 55%, which isn’t as high as some of the well-known boiler brands like Worcester Bosch and Viessmann. Warmflow boilers do have a good reliability record, though. We also had a look at the feedback on Trustpilot to see what customers are saying and we did find many excellent reviews. Even though the Which? scores could be better, Warmflow does offer an impressive range of oil boilers that come with a 5-year warranty as standard.

Below, you can find the brand data results for Warmflow oil boilers, which we sourced from the Which? website.  

Warmflow Oil Overall Score

All scores in the table are based on a Which? test conducted in October 2023.

Warmflow Oil Boiler Range

Feel free to use our table below to compare Warmflow models, efficiency ratings, typical prices and more.

MODEL	TYPE	DIMENSIONS	MAX FLOW RATE	OUTPUT	EFFICIENCY RATING	TYPICAL PRICE
Agentis Boiler House B21	Boiler House	H – 697 mm W – 395 mm D – 600 mm	N/A	15-21kW	A – 90% AND ABOVE	£1,020
Agentis Boiler House B26	Boiler House	H – 697 mm W – 395 mm D – 600 mm	N/A	21-27kW	A – 90% AND ABOVE	£1,050
Agentis Internal Heat Only 121	Regular	H – 865 mm W – 413 mm D – 602 mm	N/A	15-21kW	A – 90% AND ABOVE	£1,170
Agentis Internal Heat Only 126	Regular	H – 865 mm W – 413 mm D – 602 mm	N/A	21-27kW	A – 90% AND ABOVE	£1,230
Agentis Internal Pumped I21P	Regular	H – 865 mm W – 412 mm D – 602 mm	N/A	15-21kW	A – 90% AND ABOVE	£1,310
Agentis Internal System I21S	System	H – 865 mm W – 413 mm D – 602 mm	N/A	15-21kW	A – 90% AND ABOVE	£1,370
Agentis Internal Pumped I26P	Regular	H – 865 mm W – 412 mm D – 602 mm	N/A	21-27kW	A – 90% AND ABOVE	£1,400
Agentis Internal Heat Only 133	Regular	H – 865 mm W – 413 mm D – 602 mm	N/A	27-33kW	A – 90% AND ABOVE	£1,420
Agentis External Heat Only E21	Regular	H – 900 mm W – 413 mm D – 700 mm	N/A	15-21kW	A – 90% AND ABOVE	£1,430
Agentis Internal System I26S	System	H – 865 mm W – 413 mm D – 602 mm	N/A	21-27kW	A – 90% AND ABOVE	£1,450
Agentis External Heat Only E26	Regular	H – 900 mm W – 413 mm D – 700 mm	N/A	21-27kW	A – 90% AND ABOVE	£1,470
Agentis External Pumped E21P	Regular	H – 900 mm W – 413 mm D – 700 mm	N/A	15-21kW	A – 90% AND ABOVE	£1,540
Agentis Internal Pumped I33P	Regular	H – 865 mm W – 412 mm D – 602 mm	N/A	27-33kW	A – 90% AND ABOVE	£1,570
Agentis External Pumped E26P	Regular	H – 900 mm W – 413 mm D – 700 mm	N/A	21-27kW	A – 90% AND ABOVE	£1,600
Agentis External System E26S	System	H – 900 mm W – 413 mm D – 700 mm	N/A	21-27kW	A – 90% AND ABOVE	£1,660
Agentis External System E21S	System	H – 900 mm W – 413 mm D – 700 mm	N/A	15-21kW	A – 90% AND ABOVE	£1,670
Agentis Internal Heat Only 144	Regular	H – 1155 mm W – 595 mm D – 872 mm	N/A	33-44kW	A – 90% AND ABOVE	£1,772
Agentis External Heat Only E33	Regular	H – 900 mm W – 413 mm D – 700 mm	N/A	27-33kW	A – 90% AND ABOVE	£1,790
Agentis Internal Pumped I44P	Regular	H – 1155 mm W – 595 mm D – 872 mm	N/A	33-44kW	A – 90% AND ABOVE	£1,925
Agentis Internal System I33S	System	H – 865 mm W – 413 mm D – 602 mm	N/A	27-33kW	A – 90% AND ABOVE	£1,955
Agentis Internal Combi 121C	Combi	H – 865 mm W – 515 mm D – 602 mm	18	15-21kW	AAA – 90% AND ABOVE	£1,970
Agentis External Pumped E33P	Regular	H – 900 mm W – 413 mm D – 700 mm	N/A	27-33kW	A – 90% AND ABOVE	£1,970
Agentis External System E33S	System	H – 900 mm W – 413 mm D – 700 mm	N/A	27-33kW	A – 90% AND ABOVE	£2,040
Agentis External Heat Only E44	Regular	H – 1155 mm W – 876 mm D – 595 mm	N/A	33-44kW	A – 90% AND ABOVE	£2,100
Agentis Internal Combi 126C	Combi	H – 865 mm W – 515 mm D – 602 mm	22	21-27kW	AAA – 90% AND ABOVE	£2,120
Agentis External Combi E21C	Combi	H – 900 mm W – 550 mm D – 700 mm	18	15-21kW	AAA – 90% AND ABOVE	£2,150
Agentis External Combi E26C	Combi	H – 900 mm W – 550 mm D – 700 mm	22	21-27kW	AAA – 90% AND ABOVE	£2,200
Agentis External Pumped E44P	Regular	H – 1155 mm W – 595 mm D – 876 mm	N/A	33-34kW	A – 90% AND ABOVE	£2,360
Agentis Internal Combi 133C	Combi	H – 865 mm W – 515 mm D – 602 mm	24	27-33kW	AAA – 90% AND ABOVE	£2,450
Agentis External Combi E33C	Combi	H – 900 mm W – 550 mm D – 700 mm	24	27-33kW	AAA – 90% AND ABOVE	£2,570

Warmflow Boiler Quotes

Before you choose a Warmflow boiler, be sure to contact at least a few different installers to get a fixed quote for the boiler and the installation work. By getting a range of quotes, you can compare prices and find the best deal. You should also choose an OFTEC registered technician to fit an oil-fired boiler as they will have completed the appropriate training to carry out the installation. You can search for and find a local registered technician at the OFTEC website.

Get a Free Warmflow Boiler Quote